diff -Nru partman-crypto-101ubuntu4/debian/changelog partman-crypto-101ubuntu4.1/debian/changelog
--- partman-crypto-101ubuntu4/debian/changelog	2019-06-21 08:03:35.000000000 -0300
+++ partman-crypto-101ubuntu4.1/debian/changelog	2021-01-07 16:51:37.000000000 -0300
@@ -1,3 +1,12 @@
+partman-crypto (101ubuntu4.1) focal; urgency=medium
+
+  * Add preseed option 'partman-crypto/luksformat_options' to
+    provide more options for 'cryptsetup luksFormat' (LP: #1898129)
+    - d/partman-crypto.templates: add preseed option.
+    - lib/crypto-base.sh: check for, log, and use it.
+
+ -- Mauricio Faria de Oliveira <mfo@canonical.com>  Thu, 07 Jan 2021 16:51:37 -0300
+
 partman-crypto (101ubuntu4) eoan; urgency=medium
 
   * Drop a big block in finish.d that iterates partman, and then does
diff -Nru partman-crypto-101ubuntu4/debian/partman-crypto.templates partman-crypto-101ubuntu4.1/debian/partman-crypto.templates
--- partman-crypto-101ubuntu4/debian/partman-crypto.templates	2019-02-03 04:01:08.000000000 -0200
+++ partman-crypto-101ubuntu4.1/debian/partman-crypto.templates	2021-01-07 16:51:12.000000000 -0300
@@ -509,3 +509,8 @@
  Please enter the passphrase for the encrypted volume ${DEVICE}.
  .
  If you don't enter anything, the volume will not be activated.
+
+Template: partman-crypto/luksformat_options
+Type: string
+Description: for internal use; can be preseeded.
+ Provide additional options to the cryptsetup luksFormat command.
diff -Nru partman-crypto-101ubuntu4/lib/crypto-base.sh partman-crypto-101ubuntu4.1/lib/crypto-base.sh
--- partman-crypto-101ubuntu4/lib/crypto-base.sh	2019-03-08 09:44:50.000000000 -0300
+++ partman-crypto-101ubuntu4.1/lib/crypto-base.sh	2021-01-07 16:51:12.000000000 -0300
@@ -205,7 +205,7 @@
 }
 
 setup_luks () {
-	local mapping device cipher iv size pass
+	local mapping device cipher iv size pass luksopts
 	mapping=$1
 	device=$2
 	cipher=$3
@@ -234,7 +234,11 @@
 	fi
 
 	if [ $zkey_available -eq 0 ]; then
-		log-output -t partman-crypto /sbin/cryptsetup -c $cipher-$iv -h $hash -s $size luksFormat $device $pass
+		if db_get partman-crypto/luksformat_options; then
+			luksopts="$RET"
+			log "Additional options for luksFormat: '$luksopts'"
+		fi
+		log-output -t partman-crypto /sbin/cryptsetup -c $cipher-$iv -h $hash -s $size $luksopts luksFormat $device $pass
 		if [ $? -ne 0 ]; then
 			log "luksFormat failed"
 			return 2